Offset printing press



June 4, 1935. H M, BARBER. 2,003,799

lOFFSET PRINTING PRESS A TTORNEI/ June 4, 1935. H. M. BARBER OFFSETr PRINTING PRESS 1 7 sheets-sheet 2 Filed June 20, 1934 v ATTORNEYS June 4, 1935.l H. M. BARBER OFFSET PRINTING PRESS Filed June 20, 1934 17 Sheets-Sheet 3 VBY,

' A TTORNE YS H. M. BARBER OFFSET PRINTING PRESS Julie 4; 1935.

17 sheets-Sheet 4 Filed June 20, 1934 JN VENTOR B YM M A TTORNE YS June 4, 1935. H. M. BARBER 2,003,799

OFFSET PRINTING PRESS Filed June 20, 1934 17 Sheets-Sheet 5 /NLENTOR A TTORNEKS June 4, 1935. Hl M. BARBER OFFSET PRINTING PRESS Filed June 20, 1934 17 vSheets-Sheet 6 A ATTG/e.' NE Ys June 4, 1935. H. M. .BARBER 2,003,799

OFFSET PRINTING PRESS Filed June 20, 1934 17 Sheets-Sheet 7 A Troie/VE ys June 4, 1935. M- BARBER 2,003,799

OFFSET PRINTING PRESS Filed June 20, 1934 17 Sheets-Sheet 8 NVYENTOR A TTORNEY lJune'4, 1935. H, M, BARBER y 2,003,799

OFFSET PRINTING PRESS 275 A ffl 175 of w. l 31,15 //jj 2@ 9 /19 5767 269 /Nl/ENTo/e ATTORNEYS June 4,Y 1935.

H. M. BARBER OFFSET PRINTING PRESS 17 Sheets-Sheet lO Filed Junev 20, 1934 Y v /Nl/ENTOR A TTORNEYS H. M. BARBER June 4, 1935.

OFFSET PRINTING PRES S 17 Sheets-Sheet 1l Filed June 20, 1934 ATTORNEYS June 4, 1935- H. M. BARBER 2,003,799

' n OFFSET PRINTING PRESS Filed -June 20, 1954 1'7 Sheets-Sheet 12 /NVENTOR M 7g. gm

A TTORNEKS June 4, 1935. H. M. BARBER OFFSET PRINTING PRESS Filed June 20, 1934` 17 Sheets-Sheet 13 A TTORNE YS June 4, 1935- H. M. BARBER OFFSET PRINTING PRESS Filed June 20, 1954 1'7 Sheets-Sheet 14 [Nl/ENTOR A TTORNE Ys June 4, 1935. H, M, BARBER OFFSET PRINTING PRESS Filed June 20, 1934 17 Sheets-Sheet l5 NVENTOR A TTORNE Y6 H. M. BARBER 2,003,799

O FFSET PRINTING PRESS Filed June 20, 1954 17 Sheets-Sheef 16 June 4, 1935.

l /N VEA/TOR A TTORNE YS June 4, 1935.

H. M. BARBER OFFSET PRINTING PRESS Filed June 20, 1934 ODNTROI. STATION AUXILIARY MOT 17 Sheets-Sheet 17 AUXlLmRY MOTO coNTRoL 5r/mu ATTORNEYS Patented June 4, 1935 UNITED STATES OFFSET PRINTING PRESS Howard M. Barber, Pawcatuck, Conn., assigner to C. B. Cottrell & Sons Company, Westerly, R. I., a corporation of Delaware Application June zo, 1934, serial No; 731,439

36 Claims. (Cl. 101-220) This invention is directed to that type of offset printing presses in which a plurality of printing units are provided, each printing unit including an impression cylinder, a pair of design and transfer cylinders and an inking mechanism, and with or without moistening mechanisms; said plurality of printing units operating in unison with a suitable web advancing means such, for instance, as a folder, delivery, feeder, or two or more combined. f

This invention consists, generally, in a common drive for the web advancing means and the printing units and a separate drive for each of the pairs of design and transfer cylinders, means being provided for permitting the driving or stopping of the web advancing means and impression cylinders independently of the pairs of design and transfer cylinders; for. permitting the driving or stopping of the said pairs of design and transfer cylinders independently of the web advancing means and impression cylinders; and for permitting the independent driving of each printing unit.

This invention consists, more particularly, in the provision of a main motor for driving the plurality of printing units and the web advancing means, or for driving the web advancing means and the impression cylinders of the several printing units, and auxiliary motors for driving the pairs of design and transfer cylinders independently of their impression cylinders and the web advancing means; means being provided for bringing the main motor into and the auxiliary motors out of operative connection with the pairs of design and transferl cylinders.

This invention consists, still more particularly,

in means for separating the design and transfer cylinders of each printing unit without operatively disconnecting them, means forseparating the transfer and impression cylinders of each printing unit without operatively disconnecting them, and means for operatively disconnecting the transfer and impression cylinders of each printing unit Without operatively disconnectingl the impression cylinders from the web advancing means. l

The object of my invention is to provide an oiset printing press of the above character whereby the press crews may work independently upon either the Web advancing means and its operatively connected impression cylinders when disconnected from their pairs of designy and transfer cylinders; or independently upon the pairs of design and transfer cylinders and their inking and moistening mechanisms. Thus the web may be threaded and advanced through thepress and into the folder, if one is employed, without stopping the pairs of design and transfer cylinders; also the pairs of design and transfer cylinders and their inking and moistening mechanisms may be independently Worked upon for various purposes, as for applying plates to the design cylinders or for preparing andV adjustingthe inking and moistening mechanisms or for gumming the design cylinders, without affecting the running or stopping of the web advancing Vmeans and' impression cylinders; thereby permitting the press crews to work on the independently operating parts at the same time and thus materially shorten the period consumed for bringing the press into its full printing conditon.

A practical embodiment of my invention is represented in the accompanying drawings which illustrate a single color offset Web printing press.

Figs. 1 and 1a represent a detail top plan View of the printing press, the several coacting levers being omitted for the sake of clarity.

Figs. 2Y and 2a represent a detail side view of the press showing in diagram the printing units, the web and the web advancing means.

Figs. 3 and 3a represent a detail side View showing the gearing through which the web and the several cylinders are driven.

Figs. Vd, 4a and 4b represent a detail side elevation with the various control levers in their respective positions when the design, transfer and impression cylinders of each printing unit are contacting and interconnected and the press is running at full speed.

Figs. 5, 5fL and 5b represent a similar View showing the various control levers in their respective positions when the impression and transfer cylinders of each printing unit are separated and operatively disconnected; the design and transfer cylinders being in contact and. operatively connected, and the inking and moistening mechanisms in contact with the design cylinder, to permity coactivemovement of the designv and transfer cylinders independently lof their impression cylinder and the web advancing means, and vice versa.

- Figs. 6, 6a and 6b represent a similar view showing the various control levers in their respective positions when the inking mechanism for each printing unit is out of contact with its design cylinder, the design cylinder is out of contact with its transfer cylinder and the transfer cylinder is out of contact and operatively disconnected from its impression cylinder.

Fig. 7 represents a detail vertical cross section on an enlarged scale taken in the plane of the line VII-VII of Fig. l, looking in the direction of the arrows.

Fig. 8 represents an enlarged central section through one of the magnetic clutches which control the operative connection and disconnection of the transfer and impression cylinders.

Figs. 9 and 9a represent in detail side elevation, on the same scale as Fig. 7, the motor side of the press. i.

Fig. 10 represents a central section on the same scale as Fig. 8, of one of themagnetio clutches for controllingr the operative connection and disconnection between one of the drives and its pair of design and transfer cylinders.`

Figs. ll and lla represent the wiring diagram of the operating control for the various mechanisrns.

The two web printing units illustrated herein comprise the design cylinders I, 2, the transfer cylinders 3, 4 and the impression cylinders 5, 6. The design cylinder shafts are denoted by 1, 8, the transfer cylinder shafts by 9, I0 and the impression cylinder shafts by II, I2.

The inking mechanisms for the two printing units comprise, generally, the ink fountains I3, I4, the fountain rolls I5, I6, the fountain roll clutches I1, I8, the ductor rolls I9, 2|), the distributing rolls 2|, 22 and the design cylinderV inking rolls 23, 24.

The moistening mechanisms for the two printing units comprise, generally, the fountains 25, 25, the fountain rolls 21, 28, the ductor rolls 28, 38 and the design cylinder water applying rolls 3|, 32.

The web is denoted by 33 and it leads from its supply roll 34 to and around the impression cylinders 5 and 5 and from thence to a delivery which, in the present instance, is shown as a folder 35.'

Y 54 of the folder 35.

The Web advancing means includes the folder 35 and also the web supply roll drive which is herein shown as an endless tape carrier 38 engaging the periphery of the web supply roll 34 and passing around pulleys 31, v38, interconnected by a train of gears 39, 40, 4I, 42, 43.

Three motors are provided, the main motor 44 being arranged to either drive the web advancing means and the printing units, or the web advancing means and the impression cylinders of the printing units independently of the remainder of the printing units; and the auxiliary motors 45, 46 being arranged to independently drive the remainders of their respective printing units, i. e., the pairs of design and transfer cylinders andr their inking and moistening mechanisms.

The drive from the main motor 44 to the web advancing means, i. e., the folder 35 and the web supply roll drive comprises the following elements:

The shaft 41 of the main motor 44 is provided with a pulley 48 which drives through a belt 49, a pulley 50 on a longitudinally disposed shaft 5I. A bevel gear 52 on the shaft 5| drives a bevel gear 53 on the upright shaft Another bevel gear 55 on the shaft 5I drives a bevel gear 56 on the cross shaft 51, which cross shaft. drives through a train of gears 58, 59, B9, 6I, the shaft 62 on which the pulley 31 and gear 39 are mounted.

The drive from the main motor 44 to the..

shafts II, |2 respectively, of the impression cylinders 5, 6 of the two printing units, is as follows:

Bevel gears 63, 64 on the longitudinally disposed shaft 5I drive bevel gears 55, 96 on cross shafts 61, 68, bearing gears 69, 19 which mesh with gears 1I, 12, loosely mounted on cross shafts 13, 14. These loose gears '|'I, 'I2 drive gears 15, 1S fast on the impression cylinder shafts II, I2.

` vThe drives from the auxiliary motors 45, 46

to the shafts II, I2 of the impression cylinders 5, 6 are as follows:

The shafts 11, 18 of the auxiliary motors 45, 46 drive the cross shafts 13, 14, through reduction gear units 8|, 82, their shafts 83, 84 and magnetic clutches 85, 86. ears 81, 88 fast on the cross shafts 13, 14, drive the gears 89, 90, loosely mounted on the impression cylinder shafts II, I2.

Magnetic clutches 9|, 92 are provided for interlocking and releasing the fast gears 15, 1S of the main motor drive and the loose gears 89, 98 of the auxiliary motor drives, which gears are on the impression cylinder shafts II, I2 respectively.

The drives from the impression cylinder shafts II, I2 to their transfer and design cylinder shafts 9, ID and 1, 8 respectively, and to the inking and moistening mechanisms for the design cylinders I, 2 of the two printing units are as follows:

The loose gears 89, 90 on the impression cylinder shafts II, I2 drive gears 93, 94 fast on the transfer cylinder shafts 9, I9. Gears 95, 99 also fast on the transfer cylinder shafts 9, I9 respectively, drive gears 91, 98 fast on the design cylinder shafts 1, 8. These gears 91, 98 also drive the gears 99, |90 of the inking rollers 23, 24 and the gears IEJI, |02 of the moistening mechanisms. Gears |03, |94. fast on the design cylinder Shafts 1, 3 drive gears |96 which in turn drive gears |01, |98 fast on the shafts I 09, ||0 of the ink fountain feed mechanisms.

The means for operating the inking mechanisms for both units are follows:

Cams III, ||2 fast on the shafts |99, I3 act upon spring pressed rollers H3, II4, carried by arms II5, IIB fast on rock shafts |I1, ||8. Man- .1

ually adjustable connections II 9, |29 on the second arms |2I, |22 fast on the rock shafts |I1, II 8 are provided for corresponding ends of connecting bars |23, |24, the other ends of which bars are connected to arms |25, I 26 of the rock shafts |21, |28 of the fountain roll clutches I1, I8, to cause the fountain rolls I5, I6 to rotate, step by step. Hand screws |29, |30 are journaled in the arms IZI, |22 and adjust the connection ||9, |29 of the bars |23, |24 to control the movements of the fountain rolls I5, I 5.

The design cylinders I, 2 may be independently adjusted to bring them into proper printing contact with their transfer cylinders 3, 4, as, for instance, by mounting the design cylinders on eccentric bearings I3I, 32, adjustable rotatively by providing the bearings with arms |33, |34 from which rods |35, |35 extend to studs |31, |38 fixed to the press frame, where the rods may be screw-threaded and provided with adjusting nuts I 39, |49, cooperating with the studs |31, |38, to move the rods |35, |33 longitudinally.

The transfer cylinders 3, 4 may be independently adjusted to bring them outv of printing contact .with their impression cylinders for thickness of stock to be printed, withoutdisturbing their printing contact withthe design cylinders, and the transfer cylinders may also be independently adjusted vto bring them out of printing contact with vtheir design cylinders, when so desired. To accomplish these results the transfer cylinders are mounted on outer and inner eccentric bearings |4|, |42 andl43, |44.

`The means for independently adjustingthe transfer cylinders 3, 4, to bring them out of printing contact with their impression cylinders 5, 6 and into contact with their design cylinders |,'2, are as follows: Y

Hand levers |45, |46 are carried by rock shafts |41, |48, which are provided with eccentrics |49, 150, embraced Vby the upper members |5|, |52 of connecting rods, the lower members |53, |54 of which are attached to arms |55, |66 projecting from the outer eccentric bearings I4 42 respectively.

Adjusting screws |51, |58 are provided between -the members |5|, |52 and |53, |54 of the connecting rods to regulate the printing contact between the transfer cylinders 3, 4 and their limpression cylinders 5, 6`when inrprinting position. y

` rIvhe transfer cylinders 3, 4 are independently adjusted to bring them out of contact with their designV cylindersV l, 2, as well as their impression cylinders 5, 6, by providing the inner eccentric bearings |43, |44 'with arms |59, |60 connected to corresponding ends of rods |6|, |62, the other ends of which rods are attached to arms |63, |64 fast on rock shafts |65, |66 which are rocked from cams |61, |68 on the rotary cam shafts |69, |10, through the following connections:

Y Spring pressed studs or rollers |1|, |12 are carried by arms |13, |14 of levers pivoted at |15, |16 respectively, second arms |11, |18 of which levers being yieldingly connected through rods |19, |89 with operating forked bars |8|,y |32 connected at their lower vends to arms |83, |84 of rock levers pivoted at |85, |86, the other arms |81, |38 of which levers are spring pressed and carry studs or rollers |89,4 |90 which respectively engage the peripheries of cams |9|, |92 on the shafts |69, |10. The operating forked bars |8|, |32 have shoulders |93, |94 and |95, |96 respectively, adapted to engage the pins |9'||98 and |99, 200 respectively, carried by rock leversY 20|, 202 fast on the rock shafts |65, |66. The rod is connected to the forked bar |82 through a rock lever 205 and its connectingbar 206.

Meansvare provided for preventing the hand levers 45, |46 fromfbein'g rocked except under certain conditions to be hereinafter explained, which means are herein shown as comprising lock bars 291, 293 carried by the inner eccentric bearings |43, |44 in position to engage the diametrically opposed shoulders 299, 2|0 and 2||, 2|2, carried by the said hand levers |45, |46.

The rock levers 20|,202 have spring pressed .arranged to engage pins 22|, 222 on the operating ,forked bars 223, 224 which are connected at their corresponding ends to the depending arms 225, 226 of rock leversY pivoted at 221, 229 respectively the uprising arms 229, 239V of which levers carry spring pressed rollers 23|,

232'which ride on the faces of cams 233, 234, respectively,'fast on the shafts 1, 8 of the design cylinders 2.

The operating forkedbars 223, 224 have two shoulders 235, 236 and'231, 238 respectively, arranged to'alternately engage ythe pins 239, 240 and 24|, 242 of rock levers 243, 244 fast on'rock shafts 245, 246, which shafts are respectively provided with depending arms 241, 248 which are connected by rods 248, 250 to the depending'arms 25|, 252 Vof rock shafts 253, 254. These rock shafts 253, 254 have eccentrics 255, 256' forming-v supports for the end plates 251, 258 of the design cylinder inking roll carriages.

VThese end plates 251, 258 carry .pins 259, 260 for engagement with the lower end of latch bars 26|, 262, the upper ends of which latch bars have spring pressed lost motion connections with arms 263, 264 fast on rock shafts 265, 266. These rock shafts 265,266 have fast there-y on latch bars 261, 268, arranged to be brought into and out of engagementv with the rock arms |`|5, ||6, carried by the rock shafts ||1, ||8, the; motion of which is controlled `by the cams I||2 on the shafts |09, ||0. y r

Overthrow hand levers are pivoted at 269, 210, the han'dles being denoted by 21|, 212. These hand levers are provided-with arms 213, 214 having studs or rollers 215, 216 arrangedto be brought into and outof contact with the operating forked bars |8|, |82 respectively. These hand levers are also provided with arms 211, 218, carryingsafety rods 219, 280 arranged to be brought into and out of position to be engaged by lugs 28|, 2782 on' the outer eccentric spective shafts |69, |10 are driven from their impression cylinder shafts Y| 2 ata selected speed that will not limit the speed of the printing cylinders, through the gears 283, 284 and 285, 286. Removable stops 281, 288 are pro-r vided for holding the studs or rollers |89,

from following the periphery of their cams |9I,

The electrical control for Ithe press comprises the following elements: l

The control station v239 for the'main motor 44 includes the'two print switches 290,..29|, the run switch 292, the jog switch 293 and the stop switch 294.l 'a

The control station 295 for the auxiliary motor 45 includes the run switch 296, the jog switch 291, the stop switch 293 and the reverse switch 299.

The control station 300 for the auxiliary motor 46 includes the run switch'30|,'the jog switch 302, the stop switch 303 and the re` verse switch 304.

The`main motor clutch Amagnets are denoted by 305, 306 and Atheir Vstop switches operated mechanically from the main motor clutches are denoted by 301, 303 respectively; their switches which stop the auxiliary motors 45, 46 respectively, by' 399, 3 |0;v and themaintaining switches 

